Build fix after recent changes in wxRendererNative class.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38840 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/render/renddll.cpp

@@ -44,6 +44,14 @@ public:
     {
     }
 
+    // draw check button
+    virtual void DrawCheckButton(wxWindow *win,
+                                 wxDC& dc,
+                                 const wxRect& rect,
+                                 int flags = 0)
+    {
+    }
+
     // draw the border for sash window: this border must be such that the sash
     // drawn by DrawSash() blends into it well
     virtual void DrawSplitterBorder(wxWindow *win,
@@ -114,4 +122,3 @@ WXEXPORT wxRendererNative *wxCreateRenderer()
 {
     return new MyDllRenderer;
 }
-